November 2021 1 13 Report
Упростите выражение: 1)(a-2)(a-1)-a(a+1) 2)(b-5)(b+10)+(b+6)(b-8) 3)(2c+3)(3c+2)-(2c+7)(2c-7) 4)(3d+5)(5d-1)-(6d-3)(2-8d)
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